(this is 12 year old math) Good evening everyone​

Answer:

Step 2 has error and step 4 has error.

Step-by-step explanation:

Here we can see that elimination method is  applied to solve the  system  of equations  for which -2 is multiplied both sides of equation first

-2(x+2y)=-2(10 which is correct

but in step 2

left side is -2x-4y and the right side is -10 which has to be -20 which makes this step wrong and this is the error made by student.

in Step 4 also ,value of the y has to be 5 but student plugged y =1 which is also error by student.

Correct solution is

   -2x-4y= -20

     2x+ 5y= 15

on adding ,we get

y = -5

plugging y =5 in equation x+2y= 10 ,we get x+2(-5) =10 ,we get x = 20

therefore (20,-5) is the  solution

Answer:

step 2

Step-by-step explanation:

The fraction of the circle measured by a sector which subtends an angle; 45° is; 1/8 (one-eighth).

It has been established from circle geometry that the angle subtended at a point is 360°.

In essence, a sector which measures 45° is only 1/8 of the circle.

Read more on sectors and circles;

https://brainly.com/question/1611459

Answer: 0.80

Step-by-step explanation:

Given

80% of the precipitation falls on the lake surface

The percentage can be written as

[tex]x\%=\dfrac{x}{100}[/tex]

[tex]\therefore 80\%=\dfrac{80}{100}=0.80[/tex]

Answer:

100 hours

Step-by-step explanation:

it's very simple just reduce it to 1 carpenter 1 hour and 1 chair

Answer:

12

Step-by-step explanation:

If Hannah bought 12 pens and brought them to school, then she would have brought 12 pens to use during school.

Answer:

6.9 Miles

Step-by-step explanation:

I took the test and got it right,

They are both 6.9 miles apart after one hour if they both hike 4 miles/hour option (B) 6.9 miles is correct.

In terms of geometry, the triangle is a three-sided polygon with three edges and three vertices. The triangle's interior angles add up to 180°.

The question is incomplete.

The complete question is in the picture, please refer to the attached picture.

We have:

Miranda and Cyndi start hiking from the same point. Miranda hikes at a heading of 270° or due west, and Cyndi hikes at a heading of 30°

From the isosceles triangle:

h = 4sin30

h = 4(1/2)

h = 2 miles

From Pythagoras theorem:

x² = 4² - h² = 4² - 2²

x = √12

x = 3.46 miles

Total distance = 2×3.46  = 6.9 miles

Thus, they are both 6.9 miles apart after one hour if they both hike 4 miles/hour option (B) 6.9 miles is correct.

Learn more about the triangle here:

brainly.com/question/25813512

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Answer:

A- 4 yards

Step-by-step explanation:

Hope this helps!

Have a nice day <3

After changing the unit of 144 inches into yards the number equivalent to 144 inches is 4 yards. Hence option (a) is true.

Given that,

Change the number 144 inches into yards.

Used the concept of measurement unit which stated that,

A measurement unit is a standard quality used to express a physical quantity. Also, it refers to the comparison between the unknown quantity with the known quantity.

Since we know that,

1 yards = 36 inches

1 inch = 1/36 yards

So, we can change the number 144 inches into yards,

1 inch = 1/36 yards

144 inches = 144/36 yards

= 4 yards

Therefore, 144 inches is equivalent to 4 inches.

Option (a) is true.

To learn more about the measurement unit visit:

https://brainly.com/question/777464

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Answer:

Step-by-step explanation:

Ggjj

Answer:

3 - 13i

Step-by-step explanation:

3 - 6i - 7i

3 - 13i

Answer:

94° and 86°

Step-by-step explanation:

'x-8' = smaller angle

'x' = larger angle

x - 8 + x = 180

2x = 188

x = 94

94 - 8 = 86

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Answer: 2.5 x 5.5 = 13.75

Explanation:

I hope this helped!

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Answer:

(0,-7)

Step-by-step explanation:

4x - y = 7

-y = -4x + 7

y = 4x - 7

-4x + (4x - 7) = -7

-4x + 4x - 7 = -7

x = 0

4(0) - y = 7

-y = 7

y = -7

Step-by-step explanation:

So our m = (4+1)/(3+2) = 1

4 = -2 + b

b = 6

y = x + 6

Answer:

B. 7/30

Step-by-step explanation:

1st time to pick red is 8/16        8 red cubes out of 16 are red

2nd time to pick red is 7/15       7 red cubes out of 15 are red,

                                                      *if one red is picked already

8/16  x 7/15 = 7/30

Answer: D. 2

Step-by-step explanation:

Given

y-1=2(x--2)

Change signs

y-1=2(x+2)

Expand parenthesis

y-1=2x+4

Add 1 on both sides to isolate "y"

y-1+1=2x+4+1

y=2x+4

So the slope is 2

Hope this helps!! :)

Please let me know if you have any questions

Answer:

12

Step-by-step explanation:

Answer:

50

Step-by-step explanation:

let the number be x

15% of x= 0.15x

0.15x=30

(divide both sides by 0.15)

x= 200

25% of 200 = 25/100 *200

= 50

Answer:

she had a perfect score in 1/8 of all tests

she had a perfect score in 4 tests

Step-by-step explanation:

Tamara earned an A in 5/8 of all the tests she took.

In 1/5 of the those tests she got an A, she had a perfect score.

1/5 of 5/8 is 1/5 * 5/8 which equals 5/40 which can be reduced to 1/8.

That means that in 1/8 of all tests she took she got a perfect score.

She took a total of 32 spelling tests.

1/8 of 32 = 1/8 * 32 = 32/8 = 4

Answer:

she had a perfect score in 1/8 of all tests

she had a perfect score in 4 tests

Answer:

120

Step-by-step explanation:

Answer:

1/5

Step-by-step explanation:

What's the question being asked here?

Have an amazing day :)

-yO mAmA

Answer:

13

Step-by-step explanation:

The mode is just the number that appears the most often in a set of data. The table states that 13 appears 5 times in the data, therefore 13 is the mode.

Answer:

True

Step-by-step explanation:

So the radius would be 5 (as you times it by 2 to get 10)

Therefore

2a=10 is the same as what the circle with diameter d=2r=10

The polygons name is an octagon and is not a regular polygon

Answer:

ORange =1 -2

Step-by-step explanation:

Step-by-step explanation:

From the given figure , we can see that there are two angles whose measures are x and 2x - 30°. If we notice they are the angles on the same segment . ( Draw a line through the end points of the two lines , and they will be on the same chord) . And we know that angles of the same segment are equal . Therefore ,

[tex]\tt\to x = 2x - 30^o \\\\\tt\to 2x - x = 30^o \\\\\tt\to\boxed{\orange{\tt x = 30^o }}[/tex]

This is our required answer.

Answer: 71.43 i think

Step-by-step explanation: